Variation in seed set and proportions of outcrossed progeny with clones, crown position, and top pruning in a Douglas-fir seed orchard

Omi, Steven K.; Adams, W. T.

doi:10.1139/x86-089

Cited by 25 publications

(22 citation statements)

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“…Spatial separation of male and female flowers or variation in flowering phenology should also influence the rate of self-fertilization. Omi & Adams (1986) explain all the selfing variation, the 'inherent selffertility' was also considered to play a significant role.…”

Section: Discussionmentioning

confidence: 99%

“…The production of male and female flowers in the same individual and the absence of a prezygotic self-incompatibility system make considerable self-fertilization possible. Temporal and spatial isolation of male and female function can prevent selfing in conifers to some degree but not completely (Chung, 1981;Omi & Adams, 1986;Erickson & Adams, 1990). If the concentration of the tree's own pollen around a crown is high, the probability of selfpollination is also expected to be high.…”

Section: Introductionmentioning

confidence: 99%

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The degree of early inbreeding depression determines the selfing rate at the seed stage: model and results from Pinus sylvestris (Scots pine)

Kärkkäinen

Savolainen

1993

Heredity

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Early inbreeding depression, i.e. embryonic recessive lethals, eliminates a large proportion of selfed progeny during embryo development. A model of early inbreeding depression suggested that in most conifers the variation between genotypes in the number of lethals rather than the variation in the actual rate of self-fertilization accounts for the variation between selfing rates at the seed stage. Polyembryony, the formation of several embryos per ovule in conifers, diminished the fitness cost of embryonic lethals and allowed embryo competition. We studied variation in the outcrossing rate at the seed stage in an experimental population of Scots pine. Despite extensive variation, pollen production of the trees, which is expected to predict the probability of self-fertilization, did not account for the low selfing rate variation at the seed stage. The genotypes having lowest numbers of embryonic lethals had the highest selfing rates at the seed stage. Early inbreeding depression maintains a very low selfing rate at the seed stage and masks the correlation between the rate of selffertilization and the selfing rate at the seed stage. This is typical of most conifers and can also be common among perennial angiosperm species.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The degree of early inbreeding depression determines the selfing rate at the seed stage: model and results from Pinus sylvestris (Scots pine)

Kärkkäinen

Savolainen

1993

Heredity

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“…However, no signifi cant correlation was found between the characteristics outcrossing rate and percentage of empty seeds or percentage of full seeds (Sorensen 1971, Schroeder 1989, Kormutak and Lindgren 1996, Freytag 1998, Siregar 2000. It has been suggested that the relation would probably be clearer, when genetic load is the main factor affecting the mating system (Omi and Adams 1986). …”

Section: Relationship Between Percentage Of Empty Seeds and Genetic Fmentioning

confidence: 99%

Relationship between empty seed and genetic factors in European beech (Fagus sylvatica L.)

Wang¹

2003

Silva Fenn.

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The relationship between percentage of empty seed (Pes) and genetic factors was explored in an isolated stand of European beech (Fagus sylvatica L.). Nine allozyme loci (GOT-B, IDH-A, LAP-A, MDH-B, MDH-C, MNR-A, 6-PGDH-A, PGI-B and PGM-A) were used to estimate genetic factors. Pes ranged from 4.8% to 40.9% for seed samples of 91 trees within the stand and showed an approximate normal distribution. The average Pes was 21.4% and the repeatability of Pes was 43.4%. The multilocus estimate for outcrossing rate (t m ) based on seed samples of 30 trees within the stand was 1.015(SE = 0.011) and the mean single locus estimate was slight higher at 1.061(SE = 0.026). No evidence of biparental inbreeding was found. Weak positive correlation between Pes and maximum selfi ng rate as well as and signifi cant negative correlation between Pes and multilocus outcrossing rate indicated that self-fertilization may be explained as one of the important causes of empty seeds in beech.

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“…A mixed-mating model, including selfand cross-fertilisation probabilities only, has often been applied in forest trees (Müller-Starck, 1982b;Ritland and El-Kassaby, 1985 Omi and Adams, 1986) and from tree to tree (Erickson and Adams, 1990). Reproductive phenology was a major component determining selfing (Erickson and Adams, 1989 (Prat, 1995).…”

Section: Mating Systemmentioning

confidence: 99%

“…Self-fertilisation may substantially reduce genetic gains (Sorensen, 1982;Sorensen and White, 1988). Various studies of clonal Douglas fir seed orchards, carried out in the natural range of the species, have generally revealed a low selfing level (Omi and Adams, 1986;Erickson and Adams, 1990). However significant levels of contamination by exogenous pollen occur because of the proximity of natural populations (El-Kassaby and Ritland, 1986;Fast et al, 1986; Adams and Birkes, 1991).…”

Section: Introductionmentioning

confidence: 99%

Mating system in a clonal Douglas fir (Pseudotsuga menziesii (Mirb) Franco) seed orchard. I. Gene diversity and structure

Prat

Caquelard

1995

Ann. For. Sci.

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Summary — The clonal seed orchard studied consisted of 60 clones phenotypically selected in Douglas fir stands planted in France during the first half of the twentieth century. The genotype of every clone was characterised using isozyme techniques. Seven enzyme systems were studied, 1 was monomorphic, and 9 polymorphic loci were analysed. Seven loci (from 5 enzyme systems) were sufficient for genetic identification of each clone. Rare alleles were noticed at 7 of the 9 polymorphic loci studied. Three rare alleles were used to assess the selfing rate of individual ramets, but 2 of them might have led to erroneous results because of their selective disadvantage. The individual selfing rates, assessed from the rare allele transmission by pollen, were low (2-5%

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Variation in seed set and proportions of outcrossed progeny with clones, crown position, and top pruning in a Douglas-fir seed orchard

Cited by 25 publications

References 0 publications

The degree of early inbreeding depression determines the selfing rate at the seed stage: model and results from Pinus sylvestris (Scots pine)

The degree of early inbreeding depression determines the selfing rate at the seed stage: model and results from Pinus sylvestris (Scots pine)

Relationship between empty seed and genetic factors in European beech (Fagus sylvatica L.)

Mating system in a clonal Douglas fir (Pseudotsuga menziesii (Mirb) Franco) seed orchard. I. Gene diversity and structure

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